1 /*
2  * Copyright (c) 1987, 1993, 1994
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of the University nor the names of its contributors
14  *    may be used to endorse or promote products derived from this software
15  *    without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  */
29 
30 /* OPENBSD ORIGINAL: lib/libc/stdlib/getopt.c */
31 
32 #include "got_compat.h"
33 
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 
38 int	BSDopterr = 1,		/* if error message should be printed */
39 	BSDoptind = 1,		/* index into parent argv vector */
40 	BSDoptopt,		/* character checked for validity */
41 	BSDoptreset;		/* reset getopt */
42 char	*BSDoptarg;		/* argument associated with option */
43 
44 #define	BADCH	(int)'?'
45 #define	BADARG	(int)':'
46 #define	EMSG	""
47 
48 /*
49  * getopt --
50  *	Parse argc/argv argument vector.
51  */
52 int
53 BSDgetopt(int nargc, char *const *nargv, const char *ostr)
54 {
55 	static const char *place = EMSG;	/* option letter processing */
56 	char *oli;				/* option letter list index */
57 
58 	if (ostr == NULL)
59 		return (-1);
60 
61 	if (BSDoptreset || !*place) {		/* update scanning pointer */
62 		BSDoptreset = 0;
63 		if (BSDoptind >= nargc || *(place = nargv[BSDoptind]) != '-') {
64 			place = EMSG;
65 			return (-1);
66 		}
67 		if (place[1] && *++place == '-') {	/* found "--" */
68 			if (place[1])
69 				return (BADCH);
70 			++BSDoptind;
71 			place = EMSG;
72 			return (-1);
73 		}
74 	}					/* option letter okay? */
75 	if ((BSDoptopt = (int)*place++) == (int)':' ||
76 	    !(oli = strchr(ostr, BSDoptopt))) {
77 		/*
78 		 * if the user didn't specify '-' as an option,
79 		 * assume it means -1.
80 		 */
81 		if (BSDoptopt == (int)'-')
82 			return (-1);
83 		if (!*place)
84 			++BSDoptind;
85 		if (BSDopterr && *ostr != ':')
86 			(void)fprintf(stderr,
87 			    "%s: unknown option -- %c\n", getprogname(),
88 			    BSDoptopt);
89 		return (BADCH);
90 	}
91 	if (*++oli != ':') {			/* don't need argument */
92 		BSDoptarg = NULL;
93 		if (!*place)
94 			++BSDoptind;
95 	}
96 	else {					/* need an argument */
97 		if (*place)			/* no white space */
98 			BSDoptarg = (char *)place;
99 		else if (nargc <= ++BSDoptind) {	/* no arg */
100 			place = EMSG;
101 			if (*ostr == ':')
102 				return (BADARG);
103 			if (BSDopterr)
104 				(void)fprintf(stderr,
105 				    "%s: option requires an argument -- %c\n",
106 				    getprogname(), BSDoptopt);
107 			return (BADCH);
108 		}
109 		else				/* white space */
110 			BSDoptarg = nargv[BSDoptind];
111 		place = EMSG;
112 		++BSDoptind;
113 	}
114 	return (BSDoptopt);			/* dump back option letter */
115 }